<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        body{
            background: #cccccc;
        }
        .box{
            position: relative;
            width: 100%;
            height: 60px;
            background: white;
        }
        .box>ul{
            height: 60px;
            line-height: 60px;
            text-align: center;
            display: flex;
            justify-content: space-between;
            align-items: center;
            width: 400px;
            margin: 0 auto;

        }
        .box ul li{
            width: 100px;
            height: 60px;
            line-height: 60px;
            text-align: center;
        }
        .box ul li ul{
            opacity: .7;
            background: white;
            transform: scale(0);
            transform-origin: right top;
            transition: all .5s;
        }
        .box ul li ul li a{
            opacity: 1;
        }
        .box ul li ul li{
            float: none;
            height: 30px;
            line-height: 30px;
            text-align: center;
        }
        .box ul li:hover{
            background: #74ae0d;
        }
        .box ul li:hover>a{
            color: white;
        }
        .box ul li:hover ul{
            transform: scale(1);
        }
        a{
            text-decoration: none;
            color: #74ae0d;
        }
        li{
            list-style: none;
        }
    </style>
</head>
<body>
    <div class="box">
        <ul>
            <li><a href="#">首页</a></li>
            <li><a href="#">品牌</a>
                <ul>
                    <li><a href="#">品牌介绍</a></li>
                    <li><a href="#">发展历程</a></li>
                    <li><a href="#">品牌展示</a></li>
                    <li><a href="#">品质保障</a></li>
                </ul>
            </li>
            <li><a href="#">老乡鸡美食</a>
                <ul>
                    <li><a href="#">招牌菜品</a></li>
                    <li><a href="#">新品推荐</a></li>
                    <li><a href="#">营养早餐</a></li>
                    <li><a href="#">健康主食</a></li>
                </ul>
            </li>
        </ul>
    </div>
</body>
</html>